Wideband Pattern Reconfigurable Printed-Yagi Antenna Array Based on Feed Structure

Abstract A pattern reconfigurable antenna array with two elements is designed in this paper. The antenna element is made up of a printed Yagi and feed structure with variable phase. By changing the states of diodes in the feed structure of these two elements, the far-field radiation phase of both elements can be changed. That is, the pattern reconfigurable function of the array is realized. In this way, the impedance bandwidth of array is 75.9% (2.7~6.0 GHz), in which the peak gain direction can be switched between -θ, 0 and +θ (θ = 10°~16° at different frequencies). With the simple reconfigurable structure, the peak gain direction can be adjusted according to demands. It can be applied to broadband investigation systems. To verify the feasibility, a prototype is fabricated, measured, and reasonable agreement between the simulated and measured results is obtained.

摘要 本文设计了一款双单元方向图可重构天线阵列。该天线单元由印刷八木天线与可变相位馈电结构构成。通过改变两个单元馈电结构中二极管的工作状态，可同步调控两个单元的远场辐射相位，进而实现阵列的方向图可重构功能。该阵列的阻抗带宽达75.9%（2.7~6.0 GHz），其峰值增益方向可在-θ、0与+θ之间切换（不同频率下θ的取值范围为10°~16°）。本设计的可重构结构简洁易用，可根据实际需求灵活调整峰值增益方向，适用于宽带探测系统。为验证方案可行性，本文加工并测试了阵列样机，仿真结果与实测结果吻合良好。